I dont use Jellyfin, but I heard of some of the things it did and jellyfin sounded like a step above due to its dedicated music app and similar songs for playlists.

I use Navidrome as the server and Symfonium for the mobile app. It is by far the best option I have ever used in the 20 years of setting up a personal server. I used Subsonic before this but it was abandoned years ago and Navidrome is a fork of it. The amount of continuous effort put in and new features that still get released is fantastic. Im always excited when i see a new version drop.